Table of Contents
How can you predict the color of a flame test?
Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce. For example, copper produces a blue flame, lithium and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame.
What is the hypothesis of a flame test?
Hypothesis. If the element (independent variable) is placed in the fire (controlled variable), then the color of the fire (dependent variable) will changed based on the element that it is exposed to.
How can you identify an unknown element using a flame test?
The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a bunsen burner. The heat of the flame converts the metal ions into atoms which become excited and emit visible light.
How do you explain a flame test?
The test involves introducing a sample of the element or compound to a hot, non-luminous flame, and observing the color of the flame that results. The idea of the test is that sample atoms evaporate and since they are hot, they emit light when being in flame.
What is the purpose of flame test?
The purpose of The Flame Test is to demonstrate to students the variety of colors produced when different metals or salts meet a flame. It contributes to their understanding of: Energy. Electromagnetic Spectrum.
What is the blue part of a flame?
combustion reaction zone
This is called the “combustion reaction zone” of the flame; it glows a delicate blue color. Sometimes, however, the fuel molecules don’t burn up right away. They clump together to form particles called soot, which then swirl around inside the body of the flame without actually burning.
What causes a flame?
Fire is the result of applying enough heat to a fuel source, when you’ve got a whole lot of oxygen around. As the atoms in the fuel heat up, they begin to vibrate until they break free of the bonds holding them together and are released as volatile gases. These gases react with oxygen in the surrounding atmosphere.